Abstract: Based on the conventional meteorological observation data,aiming at the strong wind process in Yongchuan area of Chongqing during the flood season（ from May to September）in 2006-2017,this paper analyzes its temporal and spatial distribution characteristics,synoptic circulation background and the physical index. The main results are as following:（1）Strong wind process is easy to happen in the middle and north of Yongchuan,with 64 times occur in all regions totally,the most in August.Afternoon,toward evening and early morning are the high frequency periods of strong wind,the duration of strong wind is usually 1-2 h.（2）The strong wind is mainly influenced by the trough moving eastward,subtropical high in the western pacific,airflow of typhoon periphery,surface cold high pressure moving southward,the main circulation types can be divided into:the trough（vortex）type,the trough（vortex）and high pressure system type,typhoon influence type.（3）In trough（vortex） type,the average temperature most drops more than 6 ℃,it drops little or more than 4 ℃ in trough（vortex） and high pressure system type,moreover,typhoon affected temperature changes are related to the month of occurrence and the cold air from the north.（4）In all types,when strong wind happens,short-duration strong rainfall more occurs and accumulated rainfall is mainly above 25 mm.（5）From the physical index,the LI,K,CAPE,Wind-index behave differently in each type,and the actual forecasting work needs to be analyzed according to different types of thresholds.